Apparatus for casting gold inlays.



A. A. LAWRY.

APPARATUS FOR CASTING GOLD INLAYS.

APPLICATION FILED JUNE 4, I918.

Patented Jan. 7, 1919.

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ARTHURA. LAWRY, 0F VALIDOSTA, GEORGIA.

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Specification of Letters Patent: Patented Jan. 7, 1919.

, y Application filed June 4, 1918. Serial No 238,154.

Apparatus for Casting Gold Inlays; and I i do hereby declare thefollowing tobe a full, clear, and exact description of the invention,such as will enable othersskilledin the art to which it appertains tomakeand use the i by screws 7 to thetop piece or section. The

same.

, This invention relates to an improved apparatus for casting goldinlays. Oneof the objects of the invention is to provide an improvedmachine or apparatus of this kind, in which the force of gravity isutilized. e

A further-object of the invention is to provide an improved, simple,efficient and practical machine of this kind, ,which, may bemanufactured at a small cost and ,sold at a reasonable profit.

One of the features of the invention consists in the provision of aframe, a forked lever pivotally mounted thereon, and an inlay investmentcup, adapted to cooperate with a receiving cup containing moistenedmaterial, whereby the steamgenerated from the heat of the metal,adapted, to be contained in a conical container, may force the metalthrough an orifice in the bottom of the container, into a form in theinlayinvest-l.

improved machine constructed in accordance with the invention.

Fig. 2 is a plan view.

Fig. 3 is a longitudinal sectional view on line 3--3 of Fig. 2.

Fig. 4: is a transverse sectional view on line Jr-4: of Fig. 2.

Fig. 5 is a detail View of a container or holder, which at one time mayhold the wax inlay and at another time contain the gold for forming theinlay.

Referring more especially to the drawings 1 designates the frame of themachineas a whole which comprises a base 2, and anarch portion 3. Thisarch consists of the side standards 4 and a top piece 5. The sidestandards are secured to the longitudinal edges of the base by means ofscrews 6 while the upper ends of thestandards are secured upper face ofthe base 2 and the inner faces of the side standards, and the under faceof the top section are linedrespectively with pieces of asbestos 8, 9and 10. A suitable receiving cup 11 is secured by screws 12 to the underface of the asbestos piece 10 ofthe top section 5. The inner cylindricalwall of the receiving cup. is provided with an annular r1b 13. Thisreceiving cup s designed for the receptlon of any sultable moistened material 14:,such as moldine, which is composed principallyof a kind ofclay worked with glycerin. The annular rib ,13 constitutes means toretain the moistened material in ,Stlld receiving cup. A forked standard151s secured by screws 16 t0 the, base whereby it may, extendvertically. t A lever 17 is pivoted by means of thepin 18between theforks of said standard 15. A guide bracket 19 is also secured to thebase by. meansof the screws 20, with the asbestos piece 8 between theguide bracket and the base 2. This bracket comprises upstanding guidearms 21, between which the longer arm 22 of the lever 17 is guided. Theextremity of the longer arm terminates in forks 23, in bearings of theextremities of which the laterally extending diametrically arrangedaxially alined pins 24: of the inlay investment cup 25 are fulcrumed, sothat when the shorter arm of the lever is depressed, the inlayinvestment cup will uniformly engage the moistened material or moldinein the receiving cup. In constructing or molding gold inlays, the cavityis first ground and cleaned, after which a wax impression is taken ofthe cavity. The inlay investment in the cup 25 is then heated to asoftened condition. The wax impression of a cavity is then mounted inthe usual manner upon a pin (not shown), but which may be supported inthe orifice 2-6 of the holder 27. The holder is then mounted upon theinvestment cup, so that the wax impression may extend into the inlayinvestment. The inlay. investment is then allowed to harden andsubsequently to which,

the wax impression is then melted by heat from any suitable source,preferably a blow torch, and then removed, thereby forming a cavity inthe investment corresponding in shape and configuration to that in thetooth. The pin, which is supported in the orifice 26, having first beenremoved, and the gold which is placed in the conical concavity 28 of theholder 27,'is brought to a molten state by applying heat thereto fromany suitable source preferably blow-torch, whereby the molten gold maypass through the orifice 26 into the cavity of the investment to formthe inlay. The short arm of the lever 17 is then depressed, whereby themarginal edge of the investment cup is brought into uniform contact withthe moistened mat'erial'or moldine in the receiving cup, and through themedium of steam pressure generated from the heat from the molten metalon the moistened material, the gold in the holder is forced through theorifice 26 into the cavity of the inlay investment, whereby a gold inlaysuit able to enter the cavity of the tooth is constructed or molded.

The invention having been set forth what is claimed as new and usefulis 1. In a machine for moldinggold inlays, the combination with a framehaving an arch part, of a receiving cup containing moistened materialsecured to the under part of the arch, of a gravity lever pivotallymounted upon the base of the frame, and an inlay investment cupfulcrumed upon the gravity actuated end of said lever, to cooperate withthe moistened material of the receiving cup, for forming gold inlays.

52. The combination with a frame comprising a base and an arch portion,of a lever provided with a gravity actuated end pivotally mounted uponthe base, guiding means for the gravity actuated end, an inlayinvestment cup fulcrumed on the extremity of the gravity actuated end, areceiving cup secured to the under face of the arch and adapted tocontain a moistened material, with which the inlay investment cupuniformly engages, whereby gold inlays are molded through the medium ofsteam pressure.

3. The combination with a frame comprising a base and an arch portion,of a lever provided with a gravity actuated end pivotally mounted uponthe base, guiding means for the gravity actuated end, an inlayinvestment cup fulcrumed on the extremity of the gravity actuated end, areceiving cup secured to the under face of the arch and having on theinner circumference of the cyliir drical wall an annular rib forretaining therein a moistened material, withwhich the inlay investmentcup uniformly engages, whereby gold inlays are molded through the mediumof steam pressure, the upper face of the base and the inner upper andside walls of the arch being respectively lined with asbestos to avoidexcessively heating the frame.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

ARTHUR A. LAW RY.

Witnesses C. L. SMITH, JUNE BLOLOCK.

Copies of this patent may be obtained for five cents each, by addressingthe "Commissioner of Patents. Washington, D. 0.

